SQLite’s JSON functions and operators are now enabled by default, starting from SQLite 3.38.0 (released on 22 February 2022).
DBMS
Database Management Systems
Get the First Monday of a Year in SQLite
We can use SQLite’s DATE() function to return the date of the first instance of a given day of a given year. Therefore, we can use it to return the first Monday of a given year. We can also use it to return the first Tuesday, Wednesday, Thursday, Friday, etc.
We can use DATETIME() if we want a datetime value to be returned.
5 Ways to Find Rows that Contain Uppercase Letters in SQL Server
Below are five options for returning rows that contain uppercase letters in SQL Server.
How to Wrap Long Lines of Text in SQLite Results
If you’re using one of SQLite’s tabular output modes, you might find yourself battling with long lines of text that result in all subsequent columns being pushed out far to the right. This can cause you to have to keep scrolling sideways as you peruse the data.
Fortunately, there’s an easy fix.
PostgreSQL SHOW TABLES Equivalent (psql)
MySQL and MariaDB have a SHOW TABLES statement, which outputs a list of tables and views in a database. PostgreSQL doesn’t have a SHOW TABLES statement, but it does have a command that produces a similar result.
In Postgres, you can use the \dt command to show a list of tables. This is a psql command (psql is the interactive terminal for PostgreSQL).
Format SQLite Results as JSON
It’s possible to output query results as a JSON document when using the SQLite command line interface.
We can do this with the json output mode.
We can also use SQLite functions like json_object() and/or json_array() to return query results as a JSON document.
SQLite SUBSTRING() Explained
In SQLite, substring() is an alias for substr().
It returns a substring from a string, based on a given starting location within the string. Two arguments are required, and a third optional argument is accepted.
The substring() naming was introduced in SQLite 3.34.0, which was released on 1st December 2020. The reason that the substring() syntax was introduced was for compatibility with SQL Server.
How to Format SQLite Results as a Table
SQLite has a number of tabular output modes. One of these is called table mode.
Below is an example of using table mode to output SQLite’s query results as a table.
Add Weeks to a Date in PostgreSQL
In PostgreSQL, we can use the + operator to add one or more weeks to a date. We have a few options when it comes to specifying the actual number of weeks.
4 Tabular Output Modes in SQLite
The SQLite command line interface provides us with several options for outputting our results in tabular format.
These can be set using the .mode command. You simply type .mode followed by the desired output format.
Below are examples of the various tabular modes available in SQLite.